encyst / insist are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
encyst: NA
insist: (verb) be emphatic or resolute and refuse to budge. (verb) assert to be true.
encyst: NA
insist: ih·n·s·IH·s·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)